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Why the status of SLIME 2.20 (Superior Lisp Interaction Mode for Emacs) is taged as obsolete in emacs melpa considering it actually is the newest version of SLIME right now (2017/11/20).
If you have installed several versions of a package, Emacs will mark all but the newest as obsolete and offer deleting the obsolete ones as they're no longer needed (which you can do manually with ~).
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